WO2009154331A1

WO2009154331A1 - Combustion gas cleaning system

Info

Publication number: WO2009154331A1
Application number: PCT/KR2008/006216
Authority: WO
Inventors: Tae-Jin Kim
Original assignee: Tae-Jin Kim
Priority date: 2008-06-17
Filing date: 2008-10-21
Publication date: 2009-12-23
Also published as: KR20090131034A

Abstract

A combustion gas cleaning system is disclosed, which includes a water jet unit, a waste water collection tank, a waste water heating unit, a waste water separation tank, a waste sludge incineration unit, and an automated controller which controls the overall operations of the above parts. Since the water jet unit comprises a plurality of nozzles mounted in a multistage arrangement annularIy along an inner circumference of a chimney to jet water toward the center of the chimney, a hot combustion gas exhausted through a chimney can be cooled, and exhaustion of toxic substances can be prevented by cleaning the toxic substances through water adsorption. In addition, the combustion gas cleaning system is capable of effectively removing toxic substances from a combustion gas and thereby preventing exhaustion of the toxic substances through a chimney. Also, by recycling the waste water adsorbing toxic substances from a combustion gas such that no waste water is discharged to the outside, environmental pollution caused by the waste water can be prevented, while saving the cost by minimizing water consumption.

Description

[DESCRIPTION] [Invention Title]

COMBUSTION GAS CLEANING SYSTEM [Technical Field]

<i> The present invention relates to a combustion gas cleaning system for purifying a combustion gas, and more particularly to a combustion gas cleaning system capable of preventing exhaustion of toxic gases, scattering substances, smokes and dust particulates contained in hot smoke generating when burning coal, oil or other burnable substances in a boiler or an incinerator, by jetting water to the toxic gases and the like, and also capable of cleaning and recycling waste water collected.

[Background Art]

<2> Recently, air pollution has been becoming a serious social problem, which is caused by particulates contained in a combustion gas being exhausted from materials burning in a boiler or an incinerator. Therefore, exhaustion of pollutant particulates (toxic substances) of the combustion gas, including CO, CO₂, HC, NOx and so on, has been standardized and restricted by governments in many countries. Such restriction on exhaustion of the combustion gas has been being reinforced.

<3> Toxic substances contained in the combustion gas may be variable according to the burned materials. Besides the aforementioned toxic substances, the combustion gas further contains dioxin, radon and the like, which are especially fatal to human beings as cancerogenic substances.

<4> Furthermore, such toxic substances exhausted from the combustion gas severely destruct the global environment, thereby causing abnormal weather patterns such as El Nino and La Nina. Also, as the greenhouse effect of the earth is accelerated, there are happening unusual changes in the weather such as a heavy rain, a storm, a snow storm, and intense cold and intense heat.

<5> To this end, in consideration of such atmospheric pollution, a catalyst and a cleaning system have been applied to filter off the pollutant particulates. However, conventional methods have not been clear solutions to the atmospheric pollution. More specifically, in general, such a cleaning system cleans the toxic gas and the combustion gas generated during combustion of materials, by passing the gases through a chamber equipped with a back-filter or a cartridge-filter. In addition, an electric dust collecting apparatus that collects the toxic substances using difference of an electric potential or an apparatus that collects the toxic substances by jetting water particulates are used.

<6> However, the above cleaning system requires not only periodic replacement of a filter but also regular cleaning. Furthermore, the function of the cleaning system is limited in cleaning toxic substances in the form of gas.

<7> An example of prior art combustion gas cleaning system is disclosed in KR Utility Model Laid-open No. 1985-1893, entitled "Chimney crack prevention and particulates removal system" .

<8> The disclosed system is structured in such a manner that a jet orifice having a jetting hole is connected at an upper part and the middle part of a funnel through a supplying pipe in connection with a water supplying chamber of a boiler, and a checking valve equipped with a stainless steel valve is inserted in an uppermost end of the funnel.

<9> According to the "Chimney crack prevention and particulates removal system" , a water supplying pipe is mounted penetratingly from the outside to the inside, and the jet orifice is mounted at the upper end and the middle part to jet water to the inside. However, this system is disadvantageous in terms of a mounting structure since a hole should be made on an existing chimney. In addition, a high water pressure is required to supply water in an upward direction, accordingly requiring a great power. Furthermore, according to the structure, since the water pressure is higher at the middle part than the upper part, the efficiency is deteriorated. Also, this system does not have a function of treating waste water being collected since not dedicatedly equipped with a waste water purifying facility. <io> Additionally, there is another prior art combustion gas cleaning system, entitled "Collector for chimney" disclosed in KR Utility Model Publication No. 1995-5318.

<π> The "Collector for chimney" includes a collecting receptacle having a water reservoir mounted to the upper end thereof. A water supplying pipe including a plurality of water jetting holes is mounted at one side of an inner surface of the collecting receptacle. A drain hole is formed on a bottom surface of the water reservoir of the collecting receptacle, to be connected to drains of the water reservoir and the collecting receptacle mounted to the ground. In addition, a pump of the water reservoir and the water supplying pipe of the collecting receptacle are connected through a pipe, and a collecting filter is mounted between a lower end of a draining pipe of the water reservoir and the pump.

<i2> Since the "Collector for chimney" jets water with a collecting apparatus mounted at the upper part of a chimney, the upper part of the chimney should be securely structured to endure load of the water. As a result, the manufacturing cost is increased. Also, due to lack of contacting time between the jetted water and particulates exhausted from the chimney, the particulate removing efficiency is deteriorated. Furthermore, this collector is incapable of cleaning and reusing waste water being collected. [Disclosure] [Technical Problem]

<13> Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a combustion gas cleaning system comprising a water jet unit in which a plurality of nozzles are mounted in a multistage arrangement annularIy along an inner circumference of a chimney, so as to jet water toward the center of the chimney, thereby being capable of cooling a hot combustion gas exhausted through a chimney, and preventing exhaustion of toxic substances by cleaning the toxic substances through water adsorption.

<i4> It is another object of the present invention to provide a combustion gas cleaning system capable of effectively removing toxic substances from a combustion gas and thereby preventing exhaustion of the toxic substances through a chimney.

<15> It is still another embodiment of the present invention to provide a combustion gas cleaning system which circulates and reuses waste water adsorbing toxic substances from a combustion gas such that no waste water is discharged to the outside, to be capable of preventing environmental pollution caused by the waste water, and saving the cost by minimizing water consumption. [Technical Solution)

<16> In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a combustion gas cleaning system comprising a water jet unit mounted in a multistage arrangement, that is, at upper and lower parts of a water supplying pipe vertically mounted to an inner wall of a chimney of an incinerator, so as to jet water to a combustion gas being exhausted through the chimney; a waste water collection tank connected to a lower part of the chimney through a pipe to collect waste water gathering at the lower part of the chimney; a waste water heating unit which filters the waste water collected in the waste water collection tank with a filter mounted in the waste water collection tank, and then circulates the waste water through a heating pipe of the incinerator, thereby heating the waste water with a residual heat of the heating pipe; a waste water separation tank which collects and cleans the waste water heated in the waste water heating unit, and separates the waste water into waste sludge and a recycled water; a waste sludge incineration unit which selects the waste sludge separated in the waste water separation tank by a first selection valve and incinerates the waste sludge by injecting the waste sludge into an incinerating boiler; an automated controller which includes a first pump and a first solenoid valve mounted to a pipe connected between the waste water collection tank and the waste water heating unit, a second solenoid valve mounted to a pipe connected between the waste water heating unit and the waste water separation tank, the first selection valve, a second pump and a third solenoid valve which are mounted to a pipe connected between the waste water separation tank and the waste sludge incineration unit, a second selection valve, a third pump and a fourth solenoid valve which are mounted to a pipe connected between the chimney and the waste water separation tank, and a microprocessor which controls the operation of a ventilator mounted at a lower part of the waste sludge incinerator. [Advantageous Effects]

<i7> The combustion gas cleaning system according to an embodiment of the present invention comprises a water jet unit including a plurality of nozzles mounted in a multistage arrangement annularIy along an inner circumference of a chimney. Accordingly, the combustion gas cleaning system cools a hot combustion gas being exhausted through the chimney and adsorbs toxic substances being exhausted using water, thereby preventing exhaustion of the toxic substances. In addition, the combustion gas cleaning system not only effectively prevents the toxic substances from being exhausted through the chimney, but also prevents environmental pollution by cleaning and recycling waste water adsorbed with the toxic substances of the combustion gas so that no waste water is discharged to the outside. Also, the cost for cleaning the combustion gas can be reduced since consumed water quantity is minimized. [Description of Drawings!

<i8> The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

<i9> FIG. 1 shows the structure of a combustion gas cleaning system according to an embodiment of the present invention; and

<20> FIG. 2 is an enlarged perspective view of a water jet unit of the combustion gas cleaning system. [Best Mode]

<2i> Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

<22> FIG. 1 is a view showing the structure of a combustion gas cleaning system according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a water jet unit of the combustion gas cleaning system. Referring to the drawings, the combustion gas cleaning system comprises a water jet unit 10, a waste water collection tank 20, a waste water heating unit 30, a waste water separation tank 40, a waste sludge incineration unit 50, and an automated controller 60.

<23> The water jet unit 10 is mounted in a multistage arrangement, that is, at upper and lower parts of a water supplying pipe 12 vertically mounted to an inner wall of a chimney 11 of an incinerator, so as to jet water to a combustion gas being exhausted through the chimney 11.

<24> The waste water collection tank 20 is connected to a lower part of the chimney 11 through a pipe to collect waste water gathering at the lower part of the chimney 11.

<25> The waste water heating unit 30 filters the waste water collected in the waste water collection tank 20 with a filter 21 mounted in the waste water collection tank 20, and then circulates the waste water through a heating pipe of the incinerator, thereby heating the waste water with a residual heat of the heating pipe.

<26> The waste water separation tank 40 collects and cleans the waste water heated in the waste water heating unit 30, and separates the waste water into waste sludge and a recycled water.

<27> The waste sludge incineration unit 50 selects the waste sludge separated in the waste water separation tank 40 by a first selection valve 41 and incinerates the waste sludge by injecting the waste sludge into an incinerating boiler.

<28> The automated controller 60 comprises a first pump Pl and a first solenoid valve Vl mounted to a pipe connected between the waste water collection tank 20 and the waste water heating unit 30, a second solenoid valve V2 mounted to a pipe connected between the waste water heating unit 30 and the waste water separation tank 40, the first selection valve 41, a second pump P2 and a third solenoid valve V3 which are mounted to a pipe connected between the waste water separation tank 40 and the waste sludge incineration unit 50, a second selection valve 13, a third pump P3 and a fourth solenoid valve V4 which are mounted to a pipe connected between the chimney 11 and the waste water separation tank 40, and a microprocessor which controls the operation of a ventilator 51 mounted at a lower part of the waste sludge incinerator 50.

<29> More particularly, the water jet unit 10 is mounted at the upper and lower parts of the water supplying pipe 12 vertically mounted to the inner wall of the chimney 11, including a plurality of nozzles 14 arranged annularly along an inner circumference of the water supplying pipe 12 so as to jet water toward the center of the chimney 11.

<30> The waste water collection tank 20 collects the waste water in connection with the lower part of the chimney 11 and to this end, includes the filter 21 disposed in the middle thereof and constituted by a diaphragm. The filter 21 is removably mounted for replacement.

<3i> The waste water heating unit 30 comprises a pipe 31 wound in the form of a coil around the heating pipe of the incinerator. One end of the pipe 31 is connected to the waste water collection tank 20 by a pipe, passing through the first solenoid valve Vl and the first pump 1. The other end of the pipe 31 is connected to the waste water separation tank 40 by a pipe, passing through the second solenoid valve V2.

<32> The waste water separation tank 40 comprises a plurality of diaphragms, for example, first to third diaphragms 42, 43 and 44 disposed at one side therein with gradually decreasing heights, and a removable filter 45 disposed in the middle therein and constituted by a diaphragm. Therefore, when a supernatant of the waste water collected in a first space part defined by the first diaphragm 42 and sidewalls of the waste water separation tank 40 flows over the first diaphragm 42, the supernatant is collected in a second space part defined between the first diaphragm 42 and the second diaphragm 43. The supernatant of the waste water in the second space part flows over the second diaphragm 43 and is collected in a third space part defined by the second diaphragm 43 and the third diaphragm 44. Accordingly, waste sludge is collected to lower parts of the first to the third space parts. The waste water flowing over the third diaphragm 44 is filtered off by the filter 45.

<33> The waste sludge incineration unit 50, as an incinerator collecting and incinerating the waste sludge, comprises the ventilator 51 and a burner (not shown) at a lower part thereof and is connected to the waste water separation tank 40 through the pipe equipped with the third solenoid valve V3, the second pump P2, and the first selection valve 41. In addition, a jet nozzle 52 is mounted to an end of the pipe extended into the incinerator. The first selection valve 41 is connected to the waste water collection tank 20 through a pipe 46.

<34> Furthermore, the second selection valve 13 is connected to a pipe 15 which is in connection with a cleaned water storage of the waste water separation tank 40. A water pipe 16 is connected to the second selection valve 13. Additionally, the water supplying pipe 12 is connected to the second selection valve 13 such that the third pump P3 and the fourth solenoid valve V4 are mounted on the water supplying pipe 12.

<35> The automated controller 60 automatically controls the overall parts of the combustion gas cleaning system in accordance with programs set in the microprocessor. More specifically, the automated controller 60 controls the operations of the selection valves 13 and 41, the ventilator 51, the pumps Pl to P3, and the solenoid valves Vl to V4, being connected with the above respective parts.

<36> Here, it is preferred that the automated controller 60 is dedicatedly equipped with a data input unit to modify the programs set in the microprocessor.

<37> Hereinafter, the operation of the above-structured combustion gas cleansing system according to the embodiment of the present invention will be described in detail .

<38> First, when various materials are burned in the waste sludge incineration unit 50, the automated controller 60 controls the second selection valve 13, the third pump P3 and the fourth solenoid valve V4 to jet water through the nozzles 14 of the water jet unit 10 mounted in the chimney 11.

<39> Here, the waste sludge incineration unit 50 may comprise a boiler that incinerates coal, oil and other burnable substances or an incinerator dedicated to incinerate waste materials. That is, the waste sludge incineration unit 50 may be any type of incineration device as long as exhausting a combustion gas generated by incineration through a chimney.

<40> Upon the water jetting into the chimney 11, the second selection valve 13 interrupts the pipe 15 while opening the water pipe 16 such that raw water is supplied to the water pipe 16. As the fourth solenoid valve V4 is opened and the third pump P3 is operated, the raw water being supplied through the water pipe 16 is passed through the water supplying pipe 12 and jetted through the nozzles 14 of the water jet unit 10.

<4i> According to this, various substances including toxic gases, scattering substances, smokes and dust particulates contained in the combustion gas exhausted through the chimney 11 are adsorbed to the water. Therefore, the water becomes the waste water and falls down to the lower part of the chimney. The waste water is collected to the waste water collection tank 20 and filtered by the filter 21 formed in the waste water collection tank 20. Then, the automated controller 60 opens the first and second solenoid valves Vl and V2 and operates the first pump Pl, such that the filtered waste water is heated by passing through the coil pipe 31 of the waste water heating unit 30, while cooling the combustion gas being exhausted from the waste sludge incineration unit 50 to the chimney 11, and collected to the waste water separation tank 40 by passing through the second solenoid valve V2.

<42> The waste water collected to the waste water separation tank 40 is flown into the first space part. The supernatant of the waste water flows over the first diaphragm 42 into the second space part, and the supernatant in the second space part then flows over the second diaphragm 43 into the third space part, thereby being cleaned. Next, the supernatant in the third space part flows over the third diaphragm 44, thereby being filtered by the filter 45. Thus, the waste water collected to the waste water separation tank 40 is separated into the waste sludge remaining at the lower parts of the first to the third space parts, and the cleaned water passed through the filter 45.

<43> Next, the automated controller 60 operates the ventilator 51 in the waste sludge incineration unit 50, and the second pump P2. As the first selection valve 41 is selectively opened, with the third solenoid valve V3 opened, the waste sludge collected at the lower parts of the first to the third space parts of the waste water separation tank 40 or the waste sludge colleted at the lower part of the waste water collection tank 20 is selectively injected to the waste sludge incineration unit 50 through the jet nozzle 52 and incinerated.

<44> In addition, when the third pump P3 is operated by the automated controller 60 and the pipe 15 is selected by the second selection valve 13, with the fourth solenoid valve V4 opened, the cleaned water in the waste water separation tank 40 is passed through the pipe 15 and the water supplying pipe 12 and jetted through the nozzles 14 of the water jet unit 10 to be recycled. When the cleaned water in the waste water separation tank 40 is insufficient, the raw water supplied through the water pipe 16 as selected by the second selection valve 13 is jetted through the nozzles 14, passing through the water supplying pipe 12. Therefore, the toxic gases, scattering substances, smokes and dust particulates contained in the combustion gas being exhausted through the chimney 11 can be cleaned by adsorbing to the water. Furthermore, since the temperature of the combustion gas is reduced, increase of the atmosphere temperature can be prevented. Also, by preventing discharge of CO2, the green house effect can be restrained.

<45> Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

[CLAIMS] [Claim 1]

A combustion gas cleaning system, comprising-' a water jet unit mounted in a multistage arrangement, that is, at upper and lower parts of a water supplying pipe vertically mounted to an inner wall of a chimney of an incinerator, so as to jet water to a combustion gas being exhausted through the chimney; a waste water collection tank connected to a lower part of the chimney through a pipe to collect waste water gathering at the lower part of the chimney; a waste water heating unit which filters the waste water collected in the waste water collection tank with a filter mounted in the waste water collection tank, and then circulates the waste water through a heating pipe of the incinerator, thereby heating the waste water with a residual heat of the heating pipe; a waste water separation tank which collects and cleans the waste water heated in the waste water heating unit, and separates the waste water into waste sludge and a recycled water; a waste sludge incineration unit which selects the waste sludge separated in the waste water separation tank by a first selection valve and incinerates the waste sludge by injecting the waste sludge into an incinerating boiler; an automated controller which includes a first pump and a first solenoid valve mounted to a pipe connected between the waste water collection tank and the waste water heating unit, a second solenoid valve mounted to a pipe connected between the waste water heating unit and the waste water separation tank, the first selection valve, a second pump and a third solenoid valve which are mounted to a pipe connected between the waste water separation tank and the waste sludge incineration unit, a second selection valve, a third pump and a fourth solenoid valve which are mounted to a pipe connected between the chimney and the waste water separation tank, and a microprocessor which controls the operation of a ventilator mounted at a lower part of the waste sludge incinerator.

[Claim 2]

The combustion gas cleaning system according to claim 1, wherein the water jet unit mounted at the upper and lower parts of the water supplying pipe vertically mounted to the inner wall of the chimney, includes a plurality of nozzles arranged annular Iy along an inner circumference of the water supplying pipe so as to jet water toward the center of the chimney.

[Claim 3]

The combustion gas cleaning system according to claim 1, wherein the waste water collection tank includes a filter, which is removable for replacement, disposed in the middle therein and constituted by a diaphragm.

[Claim 4]

The combustion gas cleaning system according to claim 1, wherein the waste water heating unit comprises a pipe wound in the form of a coil around the heating pipe of the incinerator, such that one end of the pipe is connected to the waste water collection tank by a pipe passing through the first solenoid valve and the first pump and the other end is connected to the waste water separation tank by a pipe passing through the second solenoid valve.

[Claim 5]

The combustion gas cleaning system according to claim 1, wherein the waste water separation tank comprises first to third diaphragms disposed at one side therein with gradually decreasing heights, and a removable filter disposed in the middle therein and constituted by a diaphragm, and operates in such a manner that a supernatant of the waste water collected in a first space part defined by the first diaphragm and sidewalls of the waste water separation tank flows over the first diaphragm and is collected in a second space part defined between the first diaphragm and the second diaphragm, and the supernatant of the waste water in the second space part flows over the second diaphragm and is collected in a third space part defined by the second diaphragm and the third diaphragm, such that waste sludge is collected to lower parts of the first to the third space parts whereas the waste water flowing over the third diaphragm is filtered off by the filter.

[Claim 6]

The combustion gas cleaning system according to claim 1, wherein the waste sludge, as an incinerator collecting and incinerating the waste sludge, comprises the ventilator and a burner at a lower part thereof and is connected to the waste water separation tank through the pipe equipped with the third solenoid valve, the second pump, and the first selection valve which is in connection with the waste water collection tank through a pipe, and further comprises a jet nozzle mounted to an end of the pipe extended into the incinerator.

[Claim 7]

The combustion gas cleaning system according to claim 1, wherein the second selection valve connected with a water pipe is connected to a pipe which is in connection with a cleaned water storage of the waste water separation tank, and the water supplying pipe is connected to the second selection valve such that the third pump and the fourth solenoid valve are mounted on the water supplying pipe.

[Claim 8]

The combustion gas cleaning system according to claim 1, wherein the automated controller comprises a microprocessor to automatically control the overall parts of the combustion gas cleaning system in accordance with programs set in the microprocessor, the overall parts including the first and second selection valves, the ventilator, the first to third pumps, and the first to fourth solenoid valves.